extend

extend /ɪkˈstɛnd/ verb
extends; extended; extending
extend
/ɪkˈstɛnd/
verb
extends; extended; extending
Britannica Dictionary definition of EXTEND
1 
a  [+ object] : to cause (something, such as your arm or leg) to straighten out or to stretch out
b  [no object] : to become longer or to be able to become longer
2 
[no object] : to continue in a specified direction or over a specified distance, space, or time
3 
[no object] : to involve or include a specified person or thing — + to
4 
[+ object] : to make (something) longer or greater
5 
[+ object]
a  : to offer (something, such as an apology) to someone — usually + to
b  : to make (something) available — usually + to

extend yourself

: to work hard : to do things that require effort

— extendable

or extendible /ɪkˈstɛndəbəl/ adjective

— extender

/ɪkˈstɛndɚ/ noun, plural extenders [count]