tagurdama tähendus null.

reverse▼◼◼◼[UK: rɪ.ˈvɜːs] [US: rɪ.ˈvɝːs]

back up▼◼◼◻[UK: ˈbæk ʌp] [US: ˈbæk ʌp]

back▼◼◻◻[UK: ˈbæk] [US: ˈbæk]

back out▼◼◻◻[UK: ˈbæk ˈaʊt] [US: ˈbæk ˈaʊt]