betonen
to emphasize
To highlight and underline the importance or significance of something through words or actions.
Der Firmenchef betonte die Notwendigkeit, Kosten zu sparen.
The company director emphasized the need to save costs.

to emphasize / stress
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to emphasize
To highlight and underline the importance or significance of something through words or actions.
Der Firmenchef betonte die Notwendigkeit, Kosten zu sparen.
The company director emphasized the need to save costs.

'Betonen' (to emphasize / stress) is an inseparable verb with the prefix 'be-'. The prefix is never separated from the verb stem, and the past participle is formed without 'ge-': 'betont'.
Er hat seine Worte sehr stark betont.
He stressed his words very strongly.
The object of the verb indicates the meaning. If you stress a 'Silbe' (syllable) or a 'Wort' (word), it is about pronunciation. If you emphasize a 'Notwendigkeit' (necessity) or an 'Aspekt' (aspect), it is about importance.
Kannst du mir zeigen, wie man dieses Wort richtig betont?
Can you show me how to stress this word correctly?
To highlight what is important, 'betonen' (to emphasize) is very often followed by a subordinate clause with 'dass' or an infinitive construction with 'zu'.
Die Lehrerin betonte, dass wir die Vokabeln lernen müssen.
The teacher emphasized that we have to learn the vocabulary.
to pronounce / express
'aussprechen' and 'betonen' both have to do with speaking. 'aussprechen' is used when it is about saying a word or sound correctly. It can also mean putting a thought or wish clearly into words. 'betonen' means emphasizing a syllable or word more strongly when speaking. In addition, 'betonen' can be used to say that something is especially important. Learners often confuse the words when talking about pronunciation: 'Wie spricht man das Wort aus?' (How do you pronounce the word?) asks about the sound of the word. 'Welche Silbe betont man?' (Which syllable do you stress?) asks about the stronger part of the word.

Frau Neumann betont heute, dass alle den Antrag pünktlich abgeben müssen.
Ms. Neumann emphasizes today that everyone must submit the application on time.
Kannst du mir zeigen, wie man diesen Namen richtig ausspricht?
Can you show me how to pronounce this name correctly?