There's a natural tendency in English to use as nouns words that were originally verbs. Examples: I'm going for a walk. I'm having a talk with someone.
Dictionary definition or not, a google search for the phrase "a schlep" returns >60,000 results.
Dictionary definition or not, a google search for the phrase "a schlep" returns >60,000 results.
As applied to English, it refers to the use of a verb (in its -ing form) as a noun (for example, the verb "learning" in the sentence "Learning is an easy process for some").