BECOME THIN

Bulgarian 

отслабвам (abate, become peaky, become thin and hollow-cheeked, become weak, diminish, languish, lose weight, moderate, sag, slim, thin, weaken, wind down, wither), изсъхвам (become peaky, become thin and hollow-cheeked, crisp, drain, dry, dry up, get dry, mummify, parch, sear, season). (various references)

French

maigrir. (various references)

Hungarian

lefogy (to grow thinner, to lose flesh, to lose weight). (various references)

Indonesian

menipis (become less and less, diminish). (various references)

Japanese Kanji 

身が細る (to become thin, to lose weight), 薄らぐ (to become thin, to fade, to grow pale), 痩せる (to become thin, to lose weight, to reduceweight, to slim), 痩る (to become thin, to lose weight, to reduceweight, to slim), 瘠せる (to become thin, to lose weight, to reduceweight, to slim), 瘠る (to become thin, to lose weight, to reduceweight, to slim). (various references)

Japanese Katakana 

うすらぐ (to become thin, to fade, to grow pale), やせる (to become thin, to lose weight, to reduceweight, to slim), みがほそる (to become thin, to lose weight). (various references)

Pig Latin

ecomebay inthay.(various references)

Russian 

осунуться (become peaky, become thin and hollow-cheeked). (various references)

Scottish

tanaich. (various references)

Serbo-Croatian

postati upalih obraza (become thin and hollow-cheeked). (various references)

Spanish

ralear (become sparse), adelgazar (fall away, lose flesh, lose in weight). (various references)

Swedish

bli mager (become thin and hollow-cheeked). (various references)

Turkmen 

inзelmek. (various references)

Ukrainian

схуднути, потоншувати (thin). (various references)