びっくりして私達は口がきけなかった。

to be surprised; to be amazed; to be frightened; to be astonished; to get startled; to jump; surprise (e.g. surprise party)

we; us

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

mouth; opening; hole; gap; orifice; mouth (of a bottle); spout; nozzle; mouthpiece; gate; door; entrance; exit; speaking; speech; talk (i.e. gossip); taste; palate; mouth (to feed); opening (i.e. vacancy); available position; invitation; summons; kind; sort; type; opening (i.e. beginning); counter for mouthfuls, shares (of money), and swords

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

to tell