Green’s Dictionary of Slang

catch-up n.

[fig. use of SE]

(US) a revenge killing.

[US]C.S. Montanye ‘Frozen Stiff’ in Popular Detective Mar. 🌐 Looks like a gang catch-up from here.

In phrases

play catch-up (v.)

(US) to recover from a set-back, to make good a disadvantage.

[US]Mezzrow & Wolfe Really the Blues 218: This cat’s playin’ ketch-up and I got to tighten his wig.
[US]J. Wambaugh Secrets of Harry Bright (1986) 45: Of course the rescuers played catch-up for Otto in that all the Samoans [...] had to have buckets of water poured on them.
[UK]K. Sampson Powder 302: It was hard to persuade them to persevere with one track, ‘Beautiful’, while other stations played catch-up.
[Scot]V. McDermid Out of Bounds (2017) 62: ‘I’m only playing catch-up with my in-tray’.
[US](con. 1962) J. Ellroy Enchanters 323: ‘I’m playing catch-up with Bobby’.