Airse and stretch

The word ഉത്ഥാനം means 'rising up'. It is a tatsamam from Sanskrit.

It comes from ഉത്ഥാനം = ഉദ് (up) + സ്ഥാനം (position). I believe the 'സ' sound is lost because of sandhi rules.

A similar sounding word ഉത്താനം (meaning stretching) comes from ഉദ് (up) + താനം (stretching).

The key unto itself

Key is താക്കോൽ in Malayalam. This is a commonly used word.

It comes from താഴ് (lock) + കോൽ (stick). Makes sense.

Interestingly, though, ശബ്ദതാരാവലി does not give താഴ് as a word for lock. Could it have been related to താഴുക (to sink, to descend)?