godan verb (-ku), transitive verb
Archaic transitive verb for looking or peeping into something. Modern Japanese would normally use 覗く (のぞく) or 覗き込む (のぞきこむ).
昔の小説では、窓から差し覗く場面がよく出てくる。
In old novels, scenes of peeking in through a window often appear.
godan verb (-ku), intransitive verb
Archaic intransitive verb meaning to visit or drop in somewhere. Modern equivalents include 立ち寄る (たちよる) or 寄る (よる).
旅の途中で知人の家に差し覗く、という古い言い回しがある。
There is an old expression, 差し覗く, meaning to drop in at an acquaintance's house during a journey.