Synonyms of drop back in English:

drop back

(also drop behind)

See definition of drop back

phrase

1‘she dropped back unnoticed by the others’

SYNONYMS
fall back, fall behind, get left behind, lag behind, straggle, linger, dawdle, dally, hang back, loiter, bring up the rear, take up the rear
informal dilly-dally
archaic, literary tarry
ANTONYMS

go ahead, keep up