What is All ?
All is adj, pron 1. everything or everyone They all or All of them like coffee. All trains stop at Clapham Junction. Did you pick all (of.) the tomatoes? Where are all the children? let’s sing the song all together everyone should sing at the same time 2. fifteen all (in tennis) fifteen points each (adv) 1. completely The ground was all white after the snow fell. I forgot all about her birthday. 2. all by yourself all alone You can’t do it all by yourself. I’m all by myself this evening my girlfriend’s gone out. He drove the lorry all by himself. all along right from the beginning all but almost all in (informal.)1. tired out 2. including everything all over 1. everywhere over something 2. finished 3. everywhere
source: Easier English, Student Dictionary Upper Intermediate Level