in deep water ( synonym found)
Definition of in deep water:

°beneath the surface of the water, or of or pertaining to the region beneath the water surface.
°(nautical) beneath the water line of a vessel.
°underlying water or body of water, for example in an aquifer or the deep ocean.
°A type of lure which lies beneath the water surface.
°to water or irrigate insufficiently.
Definition of in deep water:

°beneath the surface of the water, or of or pertaining to the region beneath the water surface.
°(nautical) beneath the water line of a vessel.
°underlying water or body of water, for example in an aquifer or the deep ocean.
°A type of lure which lies beneath the water surface.
°to water or irrigate insufficiently.
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