。
His face flushed crimson with rage.
Literal
Whole-face vermillion [object-を] pouring became-angry.
A literary expression. 満面朱をそそぐ (まんめんしゅをそそぐ) is a classical set phrase meaning 'to flush crimson across one's entire face' — 満面 ('the whole face') + 朱 (しゅ, 'vermillion/crimson') + を注ぐ ('to pour'). The image is of red color flooding the face. This is exclusively literary/formal Japanese — no one says this in conversation. 怒った ('got angry') completes the scene. The entire construction reads like a passage from a novel or historical narrative.