一拥而入

to swarm in (of people etc) (idiom)

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

to hold / to embrace / to wrap around / to gather around (sb) / to throng / to swarm / to support / Taiwan pr. [yong3]

to hold in one's arms; to embrace / to surround; to gather around / to throng; to swarm / (bound form) to support (as in 擁護|拥护[yong1 hu4]) / (literary) to have; to possess / Taiwan pr. [yong3]

and / as well as / and so / but (not) / yet (not) / (indicates causal relation) / (indicates change of state) / (indicates contrast)

to enter / to go into / to join / to become a member of / to confirm or agree with / abbr. for 入聲|入声[ru4 sheng1]