mar·row 
/ˈmeroʊ/ noun
plural mar·rows /ˈmeroʊ/ noun 1 [noncount] : a soft substance that fills the bones of people and animals —called also bone marrow 2 [count, noncount] Brit : a large, long vegetable with dark green skin
to the marrow
: very much
▪ We were frozen to the marrow. [=we were very cold] ▪ The look in his eyes chilled me to the marrow. [=made me feel very fearful]
▪ We were frozen to the marrow. [=we were very cold] ▪ The look in his eyes chilled me to the marrow. [=made me feel very fearful]
