Hi,
I'd never heard of these terms, but I googled them and found this kind of definition. I hope it helps.
Clive
A monotransitive verb is a verb that takes two arguments: a subject and a single direct object. For example, the verbs buy, bite, break, and eat are monotransitive in English.
The following examples show monotransitive verbs in sentences (the direct object is in boldface):
- Yesterday, I bought a cat.
- The cat bit me!
- He broke the toothpick.
- The chef ate his own watermelon soup.
compared to
A Ditransitive Verb is one that takes both a direct object and an indirect object.
EG: He gave her the letter. ('The letter' is the direct object, what he gave, and 'her' is the indirect object, the person he gave it to. This sentence can also be written 'He gave the letter to her'.)