ingress C2+

/ˈɪnɡrɛs/ the act or means of entering a place

retrograde C2+

/ˈrɛtrəˌɡreɪd/ directed or moving backward, or reverting to a worse state

retrogress C2+

/ˌrɛtrəˈɡrɛs/ to move backward to an earlier or worse state; to decline