占上风 (pronounced zhàn shàng fēng, not zhān) is a fixed verb-object phrase meaning 'to have the upper hand' or 'to be in a dominant position'. The verb 占 means 'to occupy' and the object 上风 means 'the advantageous side'. It is commonly used in competitive contexts—games, debates, arguments, or conflicts—to indicate that one side is winning or in control. Although classified as a separable verb (v.o.), the phrase is rarely split; the unseparated form 占上风 is standard. Occasionally you might see 占了上风 to emphasize a completed state.