(simile, colloquial) very intelligent

(phonetics) The IPA diacritic of primary articulation: < ˕ >, used to denote a lowered phone; for vowels, the diacritic denotes a slightly more open utterance; for consonants, it moves the manner of articulation one step forward in this chain: nasal → plosive → fricative → approximant → trill → tap, flap → lateral fricative → lateral approximant → lateral flap.

Alternative form of hardtack

(nautical) To change course or heading. / (figuratively, by extension) To take a different approach.

Alternative form of tick tack, the sound of tapping; a device to tap on a window / Alternative form of tic-tac, a sign language used by bookmakers

(idiomatic) To last or hold out.

(nautical) A coming up into the wind and filling away again on the same tack.

Synonym of change tack.

(slang) Synonym of coffin nail (“a cigarette”)

plural of tack-up