ㄧㄢˊyánㄏㄜˊㄈㄥˋfèng

  1. 隙縫密合兒女英雄傳·》:外省多是木板鋪的上面嚴絲合縫輕易看不出。」

to fit tightly (idiom)​, to join seamlessly, to fit snugly