高壘深溝 [－垒－沟]

Jyutping gou1 leoi5 sam1 kau1
Pinyin gāo lěi shēn gōu

Definitions (Wiktionary)
  1. phrase, idiomatic
    Synonym of 深溝高壘／深沟高垒 (shēngōugāolěi, “to dig deep trenches and build high defensive walls; to fortify one's position; to dig in”).
    (syn.) 深沟高垒, 深溝高壘