qián​fú

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潜伏 (潛伏) qián​fú
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to hide oneself or lie low, typically for the purpose of spying, an ambush, or to avoid detection

The spy lurked in the enemy city for years, waiting for orders to act.

latent time word
to exist in a dormant, concealed, or incubation state

Frequency

Movie subtitles
2.80 per million appears in 1% of films
Written text
5.25 per million

Sources

Definitions
CC-CEDICT