perch (v.) ~ (on/upon sth) (of a bird) come to rest or stay (on a branch, etc)e.g.: The birds perched on the television aerial.
perch (v.) ~ (on/upon sth) 2. (of a person) sit, esp on sth high or narrow e.g.: He perched on high stools at the bar.
wind / wand/  wound  wound  / waund/(v.): (cause sth to) follow a curving, twisting or spiral course e.g.: The river winds down to the sea.