n. 25B6; noun technical pollex, opposable digit.
25B6; verb
he thumbed through his notebook : LEAF, flick, flip, riffle, skim, browse, look.
his dictionaries were thumbed and ink-stained : SOIL, mark, make dog-eared.
he was thumbing his way across France : HITCH-HIKE; informal hitch, hitch/thumb a lift.
25A0; all thumbs (Brit. informal) CLUMSY, awkward, maladroit, inept, unskilful, heavy-handed, inexpert; informal butterfingered, cack-handed, ham-fisted, having two left feet; Brit. informal all fingers and thumbs; N. Amer. informal klutzy.
25A0; thumbs down (informal) REJECTION, refusal, veto, no, negation, rebuff; informal red light, knock-back.
25A0; thumbs up (informal) APPROVAL, seal of approval, endorsement; permission, authorization, consent, yes, leave, authority, sanction, ratification, licence, dispensation, nod, assent, blessing, rubber stamp, clearance; informal go-ahead, OK, green light, say-so.