Definition of someone's heart sinks
- Her heart sank at the thought of moving so far away.
: some person : somebody
: to go to the bottom : submerge
: to become partly buried (as in mud)
: to become engulfed
: a pool or pit for the deposit of waste or sewage : cesspool
: a ditch or tunnel for carrying off sewage : sewer
: a stationary basin connected with a drain and usually a water supply for washing and drainage
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