What does 攻关 (gōngguān) mean in English?

Card 901HSK Level 4901/3571
CARD901
PROGRESS25%
攻关
攻關
gōngguān
tackle key problem(Verb)
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Reveal: Click/Space/Enter/↑↓/w/s/j/k•Navigate: ←→/h/l/a/d