- HEP
- Wise
- In the groove
- On the ball
- Groovy
- With it
- Bad word before A, B, or C, briefly
- Like cool cats
- Kind of cat
- Knowing what's up
- Cool, for cats
- On top of things
- Up on the latest
- Disease that affects the liver, for short
- With it, daddy-o
- With it, once
- Knowledgeable
- Cadence shout
- Not squaresville
- Type of cat
- In the loop
- Not square
- In the know
- With it, at one time
- Cool, in old parlance
- Far from square
- Current
- Descriptor for some old jazz musicians
- Old-school cool?
- Viral ailment with A, B, C, D, and E varieties, informally
- One, in a cadence
- Cool, in the '50s
- Informed, in slang
- Like some "cats"
- Start of a military march count-off
- Hardly squaresville
- It was "real gone" in bygone days
- Like someone wearing a zoot suit, say
- Cool, once
- Cool
- Like certain 1940s cats
- with it, in the '40
- Cadence call
- With it; cool
- Variety of cat?
- Hardly nerdy
- Word in a cadence
- Cool, like a cat
- Hardly old-fashioned, in an old-fashioned way
- Cool, old-style
- In like an old cat?
- Like a cool cat
- Savvy
- With it, old-style
- Up on the latest trends
- Coolly aware
- Aware, slangily
- Drill sergeant's call
- Wised up
- Aware of what's "in"
- Wise, man
- Not at all square
- Cool, in the '40s
- No fuddy-duddy
- Wise, at one time
- Cool, before "mod"
- __ cat ('40s jazz fan)
- In style, old-style
- Cool, to a zoot suiter
- Informed, in older slang
- Exclamation used in drilling soldiers.
- Informed: slang.
- Having inside info.
- In the know: Slang.
- Well-informed: Slang.
- ___ cat.
- On to.
- Bopster's word.
- On to: Slang.
- Bopster's term.
- Modern kind of cat.
- Teen-age word.
- Sergeant's command.
- Wise to.
- Knowing: Slang.
- Wise to: Colloq.
- Wise: Slang.
- Not square: Slang.
- Wise: Colloq.
- Knowledgeable: Slang.
- Onto, in jive talk
- Onto the jive
- Like a cat of the 40's
- Drill sergeant's word
- Marchers' word
- With it in the 40's
- Assist, in "Texian"
- Wise to the jive
- Like "cats" in the 40's
- Sarge's shout
- Like a zoot suiter
- With-it, 1940's style
- Hardly square
- Up on
- With it, 40's-style
- Jitterbug's "cool"
- Drill bit?
- Like cats, once
- With it, in the 50's
- Drillmaster's word
- Old-fashioned "cool"
- With it, in old slang
- Cool, man
- Jivey
- With it, man
- Sound repeated while marching
- With it, 50's-style
- With it, baby
- Plugged in
- Clued in, once
- Cool, to a cat
- Zoot-suited, say
- Like many a 21-Down
- Up on things, daddy-o
- Viral inflammation, informally
- In the know, in old slang
- In the know, old-style
- Lead-in for cat
- Tuned in
- Cool, '50s-style
- Cool, in old slang
- Like '40s boppers
- Up on things, in the '40s
- What was cool in the '50s?
- Cool, in jive talk
- Au courant, once
- It was cool in the '40s
- Cool, to a jive talker
- Cool, in dated slang
- Wise (to), in dated slang
- Cool, in an uncool way
- Like the latest, in the past
- Not square, once
- Cool that's no longer cool
- Cool, back in the day
- Cool, in old lingo
- In, in the past
- Sophisticated
- Drill sergeant's shout
- Cool, to a bebopper
- Like a jazz cat
- Like jazz cats
- Cool, in the 1940s
- Cool, to a 1940s cat
- ___ A vaccine
- Adjective for a cool cat
- Are You ___ to the Jive?
- Term for "au courant" that's not au courant
- Cool, then
- Trendy
- Like jazzmen
- Au courant
- Like some jazz cats
- Like a cool cat of the '40s
- Like some jazzy cats
- Cool, old-school
- With it, slangily
- Cool, decades ago
- Cool, to the older cats
- With it, if you're 78
- Cool, in jazz slang
- With it familiarly
- In on familiarly
- Part of a cadence count
- Up on trends
- Drill sergeant's intro
- Savvy about (with "to")
- Not square, to a "cat"
- Far from square, in old slang
- Far from squaresville
- Trendy, once
- Cool, in a way
- Cool, back in the 1940s
- Modern, once
- In the know, daddy-o
- Cool like a cool cat
- Cool, in the 1950s
- Cool, in jive
- With it, in dated slang
- With the time, once
