godan verb (-su), transitive verb
set adrift; let loose; cut loose
Transitive verb meaning to deliberately release something so that it floats or drifts away; often used for boats, objects on water, or metaphorically for setting something free.
彼らは小さな舟を川に漂わした。
They set a small boat adrift on the river.
風船を空
Let a balloon drift into the sky.