Longman Dictionary of Contemporary English - lucky

~ adj 1 having good luck; fortunate  (be lucky (enough) to do/be)  (You were lucky to catch him in. | John was lucky enough to be selected for the team. | lucky (that))  (He's lucky he didn't break his neck.)  (We've been very lucky with the weather.) think/count yourself lucky  (You can count yourself lucky he didn't hear you.) 2 resulting from good luck  (I didn't really know your name - it was just a lucky guess. | a lucky escape) 3 bringing good luck  (a lucky charm) 4 I/you should be so lucky! spoken used to say that someone wants something that is unreasonable and not likely to happen  (You want a transfer to the London office? You should be so lucky!) 5 lucky you/me etc! spoken used to say that someone is fortunate to be able to do something  ("I'm going out tonight." "Lucky you.")  (- see also thank your lucky stars thank (6), third time lucky third1 (2))