Tra từ underweight - Từ điển Oxford Advanced Learner 8th

under·weight [underweight] BrE [ˌʌndəˈweɪt] NAmE [ˌʌndərˈweɪt] adjective
(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.
Opp: ↑overweight

Collocations:
Diet and exercise
Weight
put on/gain/lose weight/a few kilos/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 70 kilos/(BrE) 11 stone/(especially NAmE) 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/poor body image
have/develop a positive/healthy body image
Healthy eating
eat a balanced diet/healthily/sensibly
get/provide/receive adequate/proper nutrition
contain/get/provide essential nutrients/vitamins/minerals
be high/low in calories/fat/fibre/(especially US) fiber/protein/vitamin D/Omega-3 fatty acids
contain (no)/use/be full of/be free from additives/chemical preservatives/artificial sweeteners
avoid/cut down on/cut out alcohol/caffeine/fatty foods
stop/give up/ (especially NAmE) quit smoking
Exercise
(BrE) take regular exercise
do moderate/strenuous/vigorous exercise
play football/hockey/tennis
go cycling/jogging/running
go to/visit/ (especially NAmE) 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/(especially BrE) fit
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

Example Bank:
•Her daughter was seriously underweight.
•She is a few pounds underweight for her height.
•She's dangerously underweight.