注入

to pour into / to empty into

to inject / to pour into / to concentrate / to pay attention / stake (gambling) / classifier for sums of money / variant of 註|注[zhu4]

to register / to annotate / note / comment

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]

intravenous (medicine)