M : Memories of your birth
O : Over protective
T : Tears of joy when you marry
H : Her heart will never leave you 
E : External love for you
R: Rock of support

Mother is a english noun which means,a woman who is in relation to a child,to whom she has given birth.Mother is not a acroynm,so it does not have any full form .But, many poeple have created their own full form of this noun,like that i have writen above .
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if sufficient then mark this answer be brainliest.....