sharp‧en /ˈʃɑːpən $ ˈʃɑːr-/ 
 verb [
Word Family: noun: 
sharpener, 
sharpness, 
sharp; 
adverb: 
sharp, 
sharply, 
sharpish; 
verb: 
sharpen; 
adjective: 
sharp]
1.  [intransitive and transitive] to make something have a sharper edge or point, or to become sharper: 
 Anne sharpened her pencil and got out her homework.2.  [transitive]
 Anne sharpened her pencil and got out her homework.2.  [transitive] to make a feeling stronger and more urgent: 
 A series of attacks have sharpened fears of more violence.3.  [transitive]
 A series of attacks have sharpened fears of more violence.3.  [transitive] (
also sharpen something ↔ up) to improve something so that it is up to the necessary standard, quality etc: 
 The course will help students sharpen their writing skills.
 The course will help students sharpen their writing skills.  [TahlilGaran] Dictionary of Contemporary English ▲