"Sucken" is an outdated variant of the word "suck." Its spelling can be explained through phonetic transcription using IPA symbols. The first sound is the voiceless alveolar fricative /s/, followed by the vowel sound /ʌ/, which is pronounced like the "u" in "fun." The final sound is the velar nasal /ŋ/, which is the same sound found at the end of words like "sing" or "long." Therefore, "sucken" is spelled with an "s" sound, followed by "u" and "n" sounds, and ends with the "-ng" sound.
The word "sucken" has its roots in Old English. It is derived from the Old English term "sūcan", which means "to suck". This Old English verb eventually transformed into "sucken" in Middle English. The word has retained its original meaning of "to draw into the mouth by contracting the muscles of the lips and mouth", but it can also have metaphorical usages, such as "to extract or absorb something deeply".