[in a lather] {adj.}, {slang} In great excitement; all worked up; […]

[in a nutshell] {adv. phr.}, {informal} In a few words; briefly, […]

[in a pickle] {adv. phr.}, {informal} In a quandary; in a […]

[in a pig's eye] {adv.}, {slang}, {informal} Hardly; unlikely; not so. […]

[in a pinch] {adv. phr.}, {informal} In an emergency. * /Dave […]

[in a row] See: [GET ONE'S DUCKS IN A ROW].

[in a sense] {adv. phr.} In some ways but not in […]

[in a sort of way] See: [IN A WAY] (1).

[in a spot] See: [ON THE SPOT] (2).

[in a trice] See: [IN A FLASH].