back sth up
Ⅰ back (sth) up — phrasal verb with back /bæk/ verb ► F0 to drive backwardsThesaurus+: ↑Driving and operating road vehicles
Ⅱ back sth up — phrasal verb with back /bæk/ verb 1 C2 to prove something is true: » His claims are backed up by recent research.Thesaurus+: ↑Proving and disproving2 B2 to make an extra copy of computer information: » Make sure you back up your files.→ SEE ALSO BACKUP(Cf. ↑backup)Thesaurus+: ↑Operating computers |