Green’s Dictionary of Slang

scare v.

SE in slang uses

In phrases

scared green (adj.) (also scared pink, ...white)

[20C+] terrified; thus scare someone green/pink/white.

scared shitless (adj.) (also scared fartless, ...pissless, ...shit, ...titless, shitless) [shit n. (1a)]

[1930s+] extremely frightened; thus used as a n. the scared shitless.

scared spitless (adj.) (also scared witless)

[1930s+] a euph. for scared shitless

scare someone shitless (v.) [backform. f. scared shitless ]

[1960s+] to terrify.

scare the — out of (v.)

see under relevant n.

scare up (v.) (also scare together) [SE scare up, to frighten game out of cover]

[mid-19C+] (US) to obtain, usu. with some difficulty and poss. by threatening the supplier.