noun
cert
SURT/sɜːrt/
Something regarded as certain or highly likely.
The favorite seems a dead cert to win the race.

Etymology
Cert shortens certainty in its sense of something regarded as sure, rather than the abstract feeling of confidence. The expression dead cert applies that idea to an outcome treated as guaranteed.
In context
… another way to do it is through the tls connection where the client can make a request with a tls certificate you know client cert
More examples
- She calls his appointment a cert.
- The team was considered a cert before its surprising defeat.
- There are no dead certs in this competition.
Forms
cert · certs