trip over words

• stumbleLose footing momentarily
• stammerSpeak with involuntary repetitions
• stutterInvoluntary speech repetition
• fumbleHandle with clumsy fingers
• tongue-tiedUnable to express oneself

mumble · hesitate · falter · garble · blunder · nervous · awkward · embarrassed · flustered · anxious · speech · babble · jumble · tangled · clumsy · pause · inarticulate · flub