IPA: /ˈtɔːtli/
KK: /tɔtli/
In a way that is tight or stretched without any slack; showing tension or firmness.
The rope was pulled tautly to secure the tent in place.
Tautly → It is formed from "taut" (from Old English "tawt", meaning tight or stretched) and the suffix "-ly" (meaning in a manner of). The word "tautly" means in a manner that is tight or stretched.
Think of something being 'tight' ('taut') and how it is done 'in a manner' ('-ly'). This helps you remember that 'tautly' describes how something is done tightly.