swear by
Vouch for completely
To swear by something is to have complete faith in its effectiveness or value: She swears by apple cider vinegar for everything.
The phrase suggests personal testimony—you'd vouch for it under oath.
Less commonly, to swear by something is to take an oath on it: I swear by almighty God.
trust
Trust for support
- depend onNeed or trust
- believe inAccept as true
- count onTrust reliably
- bank onTrust will occur
have faith in · put stock in · stand by · vouch for · advocate · champion · endorse · recommend
rely on
Trust for support
- depend onNeed or trust
- believe inAccept as true
- count onTrust reliably
have faith in · bank on · put stock in · stand by · vouch for · advocate · champion · endorse · recommend · back
pledge
Binding promise given
certify · assure · attest · avow · declare · warrant · give one's word · guarantee · oath · commitment
- dependencedepend, depend on, dependency, rely, need
- approvalapprove, approval rating, agree, accept, thumbs-up