s'accumuler betyder på engelska

build up▼◼◼◼(to accumulate)
verb
[UK: bɪld ʌp] [US: ˈbɪld ʌp]

pitch [pitched, pitching, pitches]▼◼◻◻(of snow, to settle and build up, without melting)
verb
[UK: pɪtʃ] [US: ˈpɪtʃ]