Jìngzhēng duìshǒu chū zhāo le, tā xuǎnzé ànbīngbùdòng, guānchá xíngshì.
The competitor made a move, but he chose to sit tight and observe the situation.
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This idiom originates from classical military strategy. 按 means to press down or hold back; the metaphor is a commander restraining (pressing down on) his troops, waiting for a strategic advantage before striking.
