Permissive mood
The permissive mood is a grammatical mood that indicates that the action is permitted by the speaker. In Lithuanian
It is one of the optative mood forms that survived (archaic) in Lithuanian. It exists only in the 3rd person. For example, a permissive mood of verb tekti (to run, to flow; about liquids; teka, "[it] runs") is tetekiė́ (let [it] run). This form has also meaning of third-person dual and plural. One of the signs of the permissive mood is the prefix te- (of unknown origin); it is added (for primary verbs, which have bisyllabic stem in present tense and stressed ending in first-person present tense) to the form of third-person singular ancient optative mood or to the form of third-person singular indicative mood for the secondary verbs and for those primary verbs, which has unstressed ending in the first-person singular form (for example, the permissive mood of bė́gti (to run; 'bė́ga', [he] runs) is tebė́ga, "let [him] run"). More examples: wikt:lt:tedirbie, wikt:lt:teaugie. See also
Hortative

References 

Grammatical moods