(fig.) to concentrate one's efforts on a particularly difficult part of one's mission
Definitions (CC-CANTO)
assault fortified positions; storm fortifications
Definitions (粵典–words.hk)
動詞
攻擊固守嘅敵人或者防禦用建築 to storm a fortified unit or a fortification
局長下令特警隊攻堅之後先發現班匪徒已經一早走咗。
局长下令特警队攻坚之后先发现班匪徒已经一早走咗。
They found the criminals are long gone when the chief ordered the SWAT team to storm their safe house.
Definitions (Wiktionary)
verb, figuratively
to surmount a difficulty; to battle
脫貧攻堅
脱贫攻坚
tuō pín gōng jiān battle against poverty
verb, literally
to assault strong defensive installation; to storm fortifications
Definitions (Kaifangcidian)
（沒有對應漢語詞彙）
Examples (粵典–words.hk)
Cantonese
局长下令特警队攻坚之后先发现班匪徒已经一早走咗。
局長下令特警隊攻堅之後先發現班匪徒已經一早走咗。
They found the criminals are long gone when the chief ordered the SWAT team to storm their safe house.