(pos:動詞)
<explanation>
yue:禁止人口出入城鎮，限制城鎮民眾外出活動；通常用嚟控制#傳染病 擴散
eng:to impose a lockdown town-wide or citywide
<eg>
yue:鑑於疫情加劇，英國決定提升防疫級別，全國封城。 (gaam3 jyu1 jik6 cing4 gaa1 kek6, jing1 gwok3 kyut3 ding6 tai4 sing1 fong4 jik6 kap1 bit6, cyun4 gwok3 fung1 sing4.)
eng:In view of the worsening pandemic, the U.K. decided to move to restrictions in a higher tier and impose a national lockdown.
