Forming the present participle of verbs, and adjectives from nouns.
[Middle English: variation of earlier -ende, later -inde, subsequently completely identified with -ing1.]
The present participle is the form of the verb used to make a continuous tense, as in he is climbing, they are walking, stop what you are doing. Any verb can form its present participle by adding -ing in this way. Such participles are often used as adjectives: he is a charming man, she is his golfing partner. Some adjectives of this type are formed from nouns instead: cunning, hulking, swashbuckling.