To pass through, pass on, change, or renew. This versatile verb describes both the passing away of what is temporary and the renewal of what endures. It is famously used in Isaiah 40:31 for the renewal of strength — those who wait on the LORD shall chalaph their strength.
Chalaph holds the paradox of the Christian life: everything earthly passes away, yet God renews His people. The seasons change (chalaph), garments wear out (chalaph), but those who hope in God exchange weakness for divine strength. Isaiah 40:31 uses this word to describe a supernatural exchange — human frailty traded for eagle-like power.