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Definition of underweight adjective from the Oxford Advanced American Dictionary

 

underweight

 adjective
adjective
NAmE//ˌʌndərˈweɪt//
 
, NAmE//ˈʌndərˌweɪt//
 
 
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(especially of a person) weighing less than the normal or expected weight The baby was dangerously underweight at birth. She is a few pounds underweight for (= in relation to) her height. opposite overweight Topic CollocationsDiet and Exerciseweight
  • put on/gain/lose weight/a few pounds
  • watch/control/struggle with your weight
  • be/become seriously overweight/underweight
  • be/become clinically/morbidly obese
  • achieve/facilitate/promote/stimulate weight loss
  • slim down to 160 pounds
  • combat/prevent/tackle/treat obesity
  • develop/have/suffer from/struggle with/recover from anorexia/bulimia/an eating disorder
  • be on/go on/follow a crash/strict diet
  • have/suffer from a negative/distorted body image
  • have/develop a positive/healthy/realistic body image
healthy eating
  • eat a balanced diet/healthily/well
  • get/provide/receive adequate/proper nutrition
  • contain/get/provide essential nutrients/vitamins/minerals
  • be high/low in calories/fat/fiber/protein/vitamin D/Omega-3 fatty acids/trans-fats
  • contain (no)/use/be full of/be free from additives/chemical preservatives/artificial sweeteners/high-fructose corn syrup
  • avoid/cut down on/cut out alcohol/caffeine/fatty foods
  • stop/quit smoking
exercise
  • get regular exercise
  • do moderate/strenuous/vigorous exercise
  • play football/hockey/tennis/soccer
  • go jogging/running
  • go to/visit/hit/work out at the gym
  • strengthen/tone/train your stomach muscles
  • contract/relax/stretch/use/work your lower-body muscles
  • build (up)/gain muscle
  • improve/increase your stamina/energy levels/physical fitness
  • burn/consume/expend calories
staying healthy
  • be/get/keep/stay healthy/in shape
  • lower your cholesterol/blood pressure
  • boost/stimulate/strengthen your immune system
  • prevent/reduce the risk of heart disease/high blood pressure/diabetes/osteoporosis
  • reduce/relieve/manage/combat stress
  • enhance/promote relaxation/physical and mental well-being
See underweight in the Oxford Advanced Learner's Dictionary