A glossary is a short list of terms (and the definitions) in a single field. All glossaries by definition contain terms, so you're repeating yourself if you say "glossary of terms."
Saying "I am coming" when actually you are going is grammatically incorrect. This often happens when you are leaving a place with the plan of coming back. It is such a confusing statement.
Rather say
I will be back (soon)
Give me a sec (when you need the...
The saying: better the devil you know than the devil you dont know often creates a problem for users of English language, most especially non-native speakers. It is usually replaced with better the devil you know than the angel you dont know, which is wrong.
Better the devil you know...
Often times, we do say 'buckle up' in place of 'buckle down'.
Buckle up means to fasten one's belt, seat belt, or buckles: She won't start the car until we've all buckled up.
Buckle down...