slo-mo UK /ˈsləʊməʊ/US /ˈsloʊmoʊ/verb 2noun 1forms 4 verb2 •To move in, or as if in, slow motion. •To apply a slow motion effect to (a video etc.). noun1 •Clipping of slow motion. formsslo-mo'd · slo-moed · slo-moing · slo-mos