Lie in sth: to exist or be found. E.g. the problem lies in deciding when to intervene.
Serve something up: to put food onto plates and give it to people. E.g. he served up a delicious meal.
Flock: a group of sheep, goats or birds of the same type. Rebaño, bandada. E.g.a flock of birds.
Unwelcome: (adj) not wanted. Desagradable, poco grato E.g. an unwelcome visitor. To avoid attracting unwelcome attention he kept his voice down. Unwelcome news.
Snob: (disapproving) a person who thinks they are much better than other people because they are intelligent or like things that many people do not like. Entendido. An intellectual snob. A food/wine, etc. snob.
Overrate somebody/something: to have too high an opinion of somebody/something; to put too high a value on somebody/something. Sobreestimar. E.g. in my opinion, Hirst's work has been vastly overrated. Opposite: underrate: menospreciar.
A good/great deal: much; a lot. E.g. they spent a great deal of money. It took a great deal of time. I'm feeling a good deal better. We see them a great deal (= often).
Enjoyable: giving pleasure. Agradable, placentero. E.g. an enjoyable weekend/experience. Highly/really/thoroughly/very enjoyable.
Stuffy: warm in an unpleasant way and without enough fresh air. Mal ventilado, cargado. A stuffy room. It gets very hot and stuffy in here in summer.
Overall: general. Total. Overall marks. There will be winners in each of three age groups, and one overall winner.